海豚没有声带，但却能发声：一个由口哨声、吱吱声、呻吟声、颤音和咔嚓声组成的复杂系统是由喷水孔内的括约肌产生的。
Dolphins lack vocal cords, nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by sphincter muscles inside the blowhole.
突然，从船舱下部传来一声微颤音，船长走下船舱去查看究竟。
Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
而在近期，麻雀声的中间部分会有一系列的滴答声，结尾处则是短促而低调的颤音。
More recent songs contain a series of clicks in the middle and a shorter, low-pitched trill at the end.
这种声音也叫作“紧喉音”，发音时拉长特定音节，这样就会让喉咙深处发出颤音，产生一种像棍子一边移动一边敲击栏杆的哒哒声。
Also known as creaky voice, it involves elongating certain syllables so that they vibrate at the back of the throat, creating a tapping sound like a stick running along a railing.
突然，从船舱下部传来一声轻微的颤音，船长走下船舱去查看究竟。
Suddenly, there was a slight trembling sound from below, and the captain went down to see what had happened.
突然，从船舱下部传来一声轻微的颤音。
英国手机的颤音和尖叫可望在不久之后为欧夜鹰的美妙歌声、狮子的咆哮或是河马的呼噜声所代替。
The sweet birdsong of the nightjar, the roar of a lion or the grunt of a hippo could soon replace the trilling and beeping of Britain's mobile phones.
突然，从下面传来一声轻微的颤音。
突然，从下面传来一声轻微的颤音。
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